Don’t Eat Too Much Three Bean Salad. The Server Will Crash.

edit: They've even zip tied it to that PVC to keep it from coming loose, which wouldn't be an issue if it was in fact attached to the pump.

I think the point was that if you flush (or - repeatedly flush) your cooling reservoir is empty now for a short while.

Funny? Not really.

There's an upper limit on the heat dissipation capability of a directly mounted heatsink, no matter how much air you throw at it. Water has a much greater heat capacity, and hence is better at removing heat from your {C,G}PUs.

In addition, the relatively lesser amount of water needed for the same cooling capacity makes it much quieter. Many people water-cool purely to build a 'silent' PC.

The next step up is thermioelectric (Peltier effect) assisted water-cooling, followed by phase-change refrigeration (same principles as household refrigerator).

The upper limit is probably(?) open-loop evaporation of cryogenic liquified gases like nitrogen, but that's mostly a gimmick for overclocking contests.